Kakuro

Language:

4x4: easy intermediate hard challenging expert
6x6: easy intermediate hard challenging expert
8x8: easy intermediate hard challenging expert
9x11: easy intermediate hard challenging expert
9x17: easy intermediate hard challenging expert

Kakuro is like a crossword puzzle with numbers. Each "word" must add up to the number provided in the clue above it or to the left. Words can only use the numbers 1 through 9, and a given number can only be used once in a word. Every kakuro puzzle has one and only solution, and can be solved through logic alone.

Kakuro Blog
Kakuro Rules
Kakuro Tutorials: Basic Challenging

Kakuro Hint: Not sure what a number is yet? Fill in its remaining possible values -- the cell will automatically resize to accommodate.

			16	13	27	12		18	12
	17	26 5					11
26							4 27
10			11 20			11			8
		18 23				6 7
	14 17			30
20				13	5 31			24
21						15 15			17
	8	19 20					17
12			15				15 16
10			27 18					23	13
	11			16 16
	6	13 33			21	21
34						15 26
7				13				4	7
	7 10			10 17			8 11
9			33
17			14

Free online kakuro puzzles